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<h1>Power Spectral Density
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<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="up.png"></a></h2>
<div class="box"><strong>PSDE - PERIODOGRAM POWER SPECTRAL DENSITY ESTIMATION</strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="up.png"></a></h2>
<div class="fragment"><pre class="comment"> PSDE - PERIODOGRAM POWER SPECTRAL DENSITY ESTIMATION

  Computes the power spectrum density of a data set by dividing the
  data into a specified number of segments, applying the time window
  on every segment, computing the periodogram for every segment and
  then average all resulting periodograms.

 PARAMETERS:

  SIGNAL

      Input one dimensional signal to be analysed.              

  SEGMENT LENGTH                                                

      The length of each segment the input data is to be divided
      into.  The peiodogram will be computed for each segment.  

  FFT LENGTH

      The length of the FFT.  If this is not radix two in will be
      shifted up to the next radix two number.  

  OVERLAP

      The size of the overlap between the segments.              

  WINDOW TYPE

     The window type can by hamm, hann, bart or rect. The length of
     window is determined by the segment length.</pre></div>

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